As the name suggests, high and low voltage distribution cabinet is the distribution equipment used for power distribution, control, metering and connecting cables in the power supply system. Generally, high-voltage switchgear is used in power supply bureaus and substations, and then led to the low-voltage distribution cabinet through the step-down low-voltage side of the transformer. The low-voltage distribution cabinet is the equipment of the distribution device that meets the design functional requirements by assembling some protective devices such as switches, circuit breakers, fuses, buttons, indicator lights, instruments and wires into one

Overload refers to the transformer whose power exceeds the nameplate power for a long time. Overload often occurs when the power plant continues to slowly increase the load, the cooling device operates abnormally, the internal fault of the transformer, etc., resulting in the overload operation of the transformer. The resulting excessive temperature will lead to the premature aging of the insulation. When the insulation paperboard of the transformer is aged, The paper strength is reduced. Therefore, the impact force of external faults may lead to insulation damage and failure. High voltage switchgear equipment will have great demand growth. High voltage switchgear is not only the basic equipment of power grid, but also the basic equipment of national economy. With the rapid development of power industry, high voltage switchgear will increase greatly. In addition, the box type substation has a wide application prospect. The substation at the end of the power grid is the intersection of medium and low voltage power grids. In recent years, China has gradually introduced and developed a box type substation encapsulated by metal shell and pre manufactured, assembled and debugged in the factory.

Other coated parts and components applied in the distribution box shall also meet the same requirements as above without falling, barge, missing plating, rust and other adverse phenomena. In addition, the distribution box shall be kept clean. In addition to the user's data, spare parts and accessories required by corresponding national specifications, the distribution box shall be free of sundries, dust, etc.